Isn “insecticidal soap” just dishwashing liquid or soap added to water?
No. Commercially produced Insecticidal soaps sold at garden centers and similar retail stores are composed of potassium salts of fatty acids from plants and animals. They work by penetrating and destroying the outer shell or membrane of the insect causing it to dehydrate and die. Some dishwashing liquids or soaps contain solvents to dissolve grease and would be injurious to a plant’s delicate tissue. Insecticidal soaps are excellent for controlling sphids, whiteflies, thirps, leafhoppers, psyllids, mealybugs and many other garden insect pests. Always ready and follow the label’s directions for use.
